To give a guy a handjob but during the handjob make it awkward but not so awkward that he doesn't want you to finish. Make it very impersonal and then right before he's about to cum let go of his dick and walk away.

Girl 1: So how'd your date with Charles go last night?
Girl 2: It was terrible and he kept begging me for a blowjob last night.
Girl 1: Please tell me you didn't blow him.
Girl 2: Of course I didn't but I gave him a handjob.
Girl 1: Did you drop the mic?
Girl 2: I did indeed drop the mic.
Girl 1: THAT'S MY GIRL *high fives*